Non-one can be 'sure' from these images that this is pascuorum. To be 'sure' you would need to see black hairs on the gaster, and I certainly do not see any. Safest ID is the subgenus, though I would not be surprised if it was actually muscorum from the silvery colour on the gaster - absolutely typical of that species, and completely unlike even pale pascuorum which are browny-yellow.